August 2015
Intermediate to advanced
312 pages
7h 28m
Japanese
Content preview from 初めてのSpark
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
124
7 章 クラスタでの動作
本書のサンプルは、ほとんどの場合 Spark のローカルモードで実行されています。このモードで
は、Spark のドライバは同じ Java のプロセス内のエクゼキュータと共に動作しています。これは
特殊なケースであり、通常の場合、各エクゼキュータはそれぞれの専用のプロセス内で動作します。
7.2.3
クラタージ
ここまでは、ドライバやエクゼキュータについて、やや抽象的な表現で議論してきました。し
かしドライバやエクゼキュータのプロセスは、まずどのようにして起動されるのでしょうか？
Spark
は、エクゼキュータの起動と、場合によってはドライバの起動も、クラスタマネージャに任
せます。
Spark
におけるクラスタマネージャは、プラガブルな構成要素です。そのため、
Spark
は
YARN
や
Mesos
といった外部のマネージャ上でも、組み込みの
Standalone
クラスタマネージャ
の上でも動作できます。
Spark のドキュメンテーションでは、Spark のアプリケーションを実行するプロセスを説明する上
では、一貫してドライバとエクゼキュータという言葉が使われてます。クラスタマネージャの中央
部分と分散している部分を表現する際には、マスターとワーカーという言葉が使われています。こ
れらの用語は簡単に混乱してしまうので、十分注意してください。例えば、Hadoop の YARN は
マスターデーモン（Resource Manager と呼ばれます）を 1 つと、Node Manager ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.